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Monoclinic Yb3+/Tm3+/Ho3+ tri-doped AgGd(WO4)2 phosphors were prepared by the high temperature solid-state method. White emission via up-conversion process consisting of the blue UC radiations at 475nm corresponding to the 1G4→3H6 transitions of Tm3+ ion, green at 542nm to the 5F4, 5S2→5I8 transition of Ho3+ ions and red at 650nm including both the 5F5→5I8 transition of the Ho3+ ion and the 1G4→3F...
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